Lennox often uses these two numbers interchangeably for the same interlock switch assembly

replacing the entire R45408-001 harness is recommended to maintain the integrity of the system's safety circuits and avoid high-resistance connections

The pilot is designed to handle control air pressures that translate through the 3-7/8:1 ratio to meet the desired steam delivery pressure

including the GSZ and GSX series

Trane FLR8618 Filter 340155-7026 Lennox often uses these twoThe Trane FLR8618 Filter 2 Pack is a critical maintenance component for technicians servicing Trane EV100 series HVAC systems and specific air handlers. These OEM Trane replacement filters are engineered with a MERV 11 rating, utilizing high efficiency fiberglass media to capture fine particulate matter including dust, pollen, and airborne allergens. Each filter in this 2 pack set measures approximately 16 x 17. 65 x 0. 5 inches, ensuring a precise